| 摘要 |
A fuel delivery device is reduced in size by reducing the size of a float, and has reliability in operating its valve means and favorable response of the valve means, and general applicability to various vehicle types. As for a manufacturing method of the device, ultrasonic welding with resin which is the most preferable method considering the material and the cost is employed so that the designed valve opening/closing reliability and response can be easily achieved. For realizing such a device, this invention provides a multi-stage valve assembly in which a plurality of valves are provided, the uppermost valve is connected to a float, and slide members which have stoppers provided on the distal ends thereof and are provided on one of the valves which make a pair, are inserted in guide members provided on the other valve in such a manner that the stoppers can be engaged with the guide members. It may be a two-stage valve assembly in which a secondary valve and a primary valve are disposed concentrically and operated in association with each other, or a three-stage valve assembly comprising a secondary valve, an intermediate valve and a primary valve.
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